Java 利用dom方式读取、创建xml详解及实例代码

Java 利用dom方式读取、创建xml详解

1.创建一个接口

XmlInterface.Java

public interface XmlInterface
{
/**
*
建立XML文档
*
@param fileName 文件全路径名称
*/
public void createXml(String
fileName);
/**
*
解析XML文档
*
@param fileName 文件全路径名称
*/
public void parserXml(String
fileName);
}

接口实现

XmlImpl.java

package com.test.xml;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class XmlImpl implements XmlInterface{
private Document
document;
public void init()
{
try {
DocumentBuilderFactory
factory = DocumentBuilderFactory
.newInstance();
DocumentBuilder
builder = factory.newDocumentBuilder();
this.document
= builder.newDocument();
} catch (ParserConfigurationException
e) {
System.out.println(e.getMessage());
}
}
public void createXml(String
fileName) {
Element
root = this.document.createElement("scores");
this.document.appendChild(root);
Element
employee = this.document.createElement("employee");
Element
name = this.document.createElement("name");
name.appendChild(this.document.createTextNode("wangchenyang"));
employee.appendChild(name);
Element
sex = this.document.createElement("sex");
sex.appendChild(this.document.createTextNode("m"));
employee.appendChild(sex);
Element
age = this.document.createElement("age");
age.appendChild(this.document.createTextNode("26"));
employee.appendChild(age);
root.appendChild(employee);
TransformerFactory
tf = TransformerFactory.newInstance();
try {
Transformer
transformer = tf.newTransformer();
DOMSource
source = new DOMSource(document);
transformer.setOutputProperty(OutputKeys.ENCODING, "gb2312");
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
PrintWriter
pw = new PrintWriter(new FileOutputStream(fileName));
StreamResult
result = new StreamResult(pw);
transformer.transform(source,
result);
System.out.println("生成XML文件成功!");
} catch (TransformerConfigurationException
e) {
System.out.println(e.getMessage());
} catch (IllegalArgumentException
e) {
System.out.println(e.getMessage());
} catch (FileNotFoundException
e) {
System.out.println(e.getMessage());
} catch (TransformerException
e) {
System.out.println(e.getMessage());
}
}
public void parserXml(String
fileName) {
try {
DocumentBuilderFactory
dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder
db = dbf.newDocumentBuilder();
Document
document = db.parse(fileName);
NodeList
employees = document.getChildNodes();
for (int i
= 0;
i < employees.getLength(); i++) {
Node
employee = employees.item(i);
NodeList
employeeInfo = employee.getChildNodes();
for (int j
= 0;
j < employeeInfo.getLength(); j++) {
Node
node = employeeInfo.item(j);
NodeList
employeeMeta = node.getChildNodes();
for (int k
= 0;
k < employeeMeta.getLength(); k++) {
System.out.println(employeeMeta.item(k).getNodeName()
+ ":" +
employeeMeta.item(k).getTextContent());
}
}
}
System.out.println("解析完毕");
} catch (FileNotFoundException
e) {
System.out.println(e.getMessage());
} catch (ParserConfigurationException
e) {
System.out.println(e.getMessage());
} catch (SAXException
e) {
System.out.println(e.getMessage());
} catch (IOException
e) {
System.out.println(e.getMessage());
}
}
}

测试

public class Main
{
public static void main(String
args[]){
XmlImpl
dd=new XmlImpl();
String
str="D:/grade.xml";
dd.init();
dd.createXml(str); //创建xml
dd.parserXml(str); //读取xml
}
}

结果

生成xml

<?xml version="1.0" encoding="GB2312"?>
<scores>
<employee>
<name>wangchenyang</name>
<sex>m</sex>
<age>26</age>
</employee>
</scores>

读取xml

生成XML文件成功!
#text:
name:wangchenyang
#text:
sex:m
#text:
age:26
#text:
解析完毕

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